Inclinometer.



l. L MARSHALL.

NCLINOIWETER.

Amlemmw min maus. 19|?.

l @Wmn meme@ my 2, 19m

WITNESSES NVENTOF! ATTORNEY f. terrore.

JAMES IIE. HMRSMLL, 0F UAIMIEY, KANSAS.

To all whom t 'may concern:

citizen of the United States, residing at Coney,l in the county of Montgomery and State of Kansas, have invented certain new and useful Improvements in llnclinorneters, of which the following is a specication..

This invention has relation to levels for aeroplanes, airships or the like, and has for an object to provide a device for the purpose of indicating the extent of inclination of the machine either longitudinally or laterally relative to the surface of the ground.

Another object of the invention is to provide a device of this character embodying one or more indicating elements, pivotally mounted and Weighted so that one or the other may maintain at all times a vertlcal position irrespective of the inclination of pended claim.

*In the accompanying drawings in which similar and corresponding parts are designated by the same characters of reference thoughout'the several views in which they appear Figure 1, is a view in front elevation ot' the preferred form of my level indicator.

Fig. 2, is a vertical section taken on the A line 2-2 of. the preceding ligure.

Fig. 3, is a vertical section taken on the line 3-3 thereof.

With reference to the drawings, 10 and 11 indicate drums disposed in a vertical plane and at relative right angles. Both drums are supported upon a traine `which is indicated at 1&2. The frame 12 carries at one end a pair of upstanding arms 13, apertured at their upper ends to receive trunnions 14 which projects Yfrom the periphery of the drum 10 to pivotally support the same between the arms. ln order that the drum 10 may be retained at all times in an upv right position thetrunnions 14e are located slightly above a horizontal line taken diametrically through the drum.

rll`he other drinn 11 is pivotally mounted upon upstanding arms 15 which are mountspecifwaua or netten, raient.

Application led .august 29, 191'?.

IINCMENJMLETEJR..

Patented l it", erial No. 1635558.

extend from a point marked zero at the upper edge of both drums, down both sides to a point marked the graduations zero and 180 being both located in a vertical diametrical plane. l v

Mounted centrally upon the drum 10 is a pointer 17 for pivotal movement, having the lower end weighted as at 18, and the upper end bent as at 19 to extend over the periphery of the drum.

A pivot 20 is supported upon the drum 1l centrally thereof whereby to support for rotation a pointer 21, having its lower end Weighted and its upper end bent over the upper edge of the drum 11 in the manner of the pointer 17.

lt will be noted that the drums 10 and 11 are mounted in a manner to permit oscil latein7 movement thereof in directions at right angles to each other.

The frame 12 is provided with an integrally formed depending bolt 22 which is adapted to extend through an elongated opening or slot 23 of one arm 2l of an angle bracket, the other arm 25 being apertured to permit the passage of bolts therethrough to secure the angle brackets to some stationary portion of the aeroplane. A thumb nut 26 applied to the bolt 22 serves to secure the frame in place subsequent to adjustment longitudinally of the bracket.

ln use, the device is mounted in an aeroplane in such a way as to dispose the drum l() transversely of the machine and the drum 11 longitudinally thereof. li will be apparent that when in flight the 'forward or rearward inclination of the machine will be indicated bv the pointer 12 which, being weighted to maintain a vertical pof-,ition will indiM cate upon the graduationsl of the drum 11 the extent et ,the inclination whether the drum is in a forward or rearward direction. (lonversely. should the machine be inclined laterally to one side or the other this fact till lll

liti@ lllti will be indicated by the pointer 17 upon the graduations of the drum 10 since an inclination of the machine in a forward direction, either downwardly or upwardly is lirequently accompanied by an .inclination ot the machine laterally, Jlllso the drum 10 is pivot/eel to permit free movement ol .the

lill

inclinations of the n'lachine.

pointer 17 when the machine is inclinedin this manner to indicate the extent of both An illuminant of any character desired may be positioned above the device so as to illuminate the dials when traveling' at night.

Having thus described my invention what I claim as new and desire to secure by Let-y ters Patent is:-

An inclinometer including an angular bracket having a slot in one arm, a threaded member extending therethrough, awing nut applied to Said threaded member to secure the same in place, a plate mounted on said threaded member and having at each end a pair of upstanding horizontally spaced arms,

sai-d pairs of arms heilig located at relative right angles, a drum pivotally mounted withm the extremities o' each pair ot arms for oscillation in a vertical plane, said drums bearing graduations upon one side face, and their eripheries7 and a weighted pointer pivota ly mounted upon the center of each drum and having one end bent at right angles to extend across the periphery of the drum.

In testimony whereof I aix my signature in presence of two witnesses.

JAMES E. MARSHALL.` Witnesses:

RICHARD B. OWEN, M. E. JONES. 

